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用解析方法求出消除中心视场球差、彗差及像散的偏轴两镜系统的结构及面形参数．根据解出的参数进行光线追迹，得到中心视场像斑尺寸在０．２″以内．要改善边缘视场的像质，需要在双曲率面镜上加高次项，并偏离解出的某些参数．对于Ｆ／１１左右的系统，可以得到±０．６°视场边缘有１．５″～１．９″的像斑角尺寸．这种系统的子午与弧矢焦距不等，相差在１％以内．
The analytic method was used to find out the structure and surface shape parameters of the off-axis two-mirror system which eliminates spherical aberration, coma and astigmatism in the central field of view. According to the extracted parameters of ray tracing, the center field of view spot size of 0.2 “or less.To improve the edge of the field of view of the quality, you need to hyperbolic mirror plus higher terms, and deviate from the solution Some parameters. For systems around F / 11, a spot angle of 1.5 ”to 1.9" can be obtained for a ± 0.6 ° field of view edge. The system’s meridional and sagittal focal lengths are not constant, A difference of less than 1%.